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• W2144450136 endingPage "4649" @default.
• W2144450136 startingPage "4639" @default.
• W2144450136 abstract "Abstract Strategies for exploring anionic templates to direct sophisticated supramolecular assembly have attracted attention. Herein, a series of new anion receptors 1 – 3 containing two indole‐based binding sites bridged by linking spacer pyrazino[2.3‐ g ]quinoxaline (PQ) have been rationally designed and prepared from the precursors 2,3‐diindol‐3′‐yl quinoxaline (DIQ) and 5,6‐dihydrodiindolo[3,2‐ a :2′,3′‐ c ]phenazine (DIPZ). X‐ray analyses showed a self‐connected network and dimeric packing through hydrogen bonding and π–π stacking interaction in the solid state in the structures of 1 and 2 , respectively. All three receptors exhibited a series of prominent absorption bands from the expanded π system. The indole‐based expanded receptors were found to strongly and selectively bind F − , AcO − , and H 2 PO 4 − among the tested anions (F − , Cl − , Br − , AcO − , H 2 PO 4 − , HSO 4 − , NO 3 − , and ClO 4 − ), and operated as efficient colorimetric sensors for naked‐eye detection of fluoride anions in DMSO. These tailored building blocks captured two anions located at far‐spaced binding sites, and adopted noninterfering anion‐binding processes to guarantee the anion‐binding affinity, topology, and dimensionality. Solid‐state studies elucidated that the neutral 1 – 3 interacted with the tetrahedral dihydrogen phosphate anion in proper proportions and designed topologies, thus leading to the formation of a series of multidimensional networks by self‐assembly in the solid state. The observations showed a well‐characterized phosphate‐directed assembly of multidimensional metal‐free coordination polymers in the solid state, in which the formed phosphate aggregates, including dimer encapsulated in an indole‐mediated hydrogen‐bonded pocket and an infinite chain, behaved as anionic templates to direct the self‐assembly. However, no evidence proved the presence of such phosphate‐directed infinite coordination polymers in solution." @default.
• W2144450136 created "2016-06-24" @default.
• W2144450136 creator A5068080767 @default.
• W2144450136 creator A5090486781 @default.
• W2144450136 date "2010-04-09" @default.
• W2144450136 modified "2023-10-18" @default.
• W2144450136 title "Pyrazino[2.3-<i>g</i>]quinoxaline-Bridged Indole-Based Building Blocks: Design, Synthesis, Anion-Binding Properties, and Phosphate-Directed Assembly in the Solid State" @default.
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